My report is that we were foiled by a sick child! We got half way into DC from Chantilly and had to turn back around! Perhaps on the next go round, as we leave tomorrow. But we did hit the air and space museum annex and it was SO much better than the original one downtown. I highly recommend it if you're in the area. They had a Concorde, the discovery shuttle, the enola gay... And it was clean and way less crowded.